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Formula: Ca2(Ca1.5Zr0.5)Na(NaCa)Ti(Si2O7)2(OF)F2
Sorosilicate (Si2O7 groups), seidozerite supergroup,
zirconium- and titanium- bearing mineral
Specific gravity: 3.195 calculated
Hardness: 5
Streak: Pale yellow to beige
Colour: Pale yellow to brown
Luminescence: Fluoresces weak yellow under UV (100–280 nm)
Environments
Volcanic igneous environments
Pegmatites
Bortolanite is a new mineral, approved in 2021.
Localities
At the type locality, the Bortolan quarry, Poços de Caldas, Poços de Caldas alkaline complex, Minas Gerais, Brazil,
bortolanite occurs in the matrix of evolved subvolcanic phonolites
and nepheline syenite
pegmatites. Associated minerals include
götzenite, nepheline,
K-feldspar, aegirine,
natrolite, analcime and
manganese-bearing pectolite.
Bortolanite is of late magmatic origin, and occurs as aggregates from 1 mm to 1.5 cm in size
(CM 60.4.699-712).
Bortolanite from the Bortolan Quarry -
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At the Lovozersky District, Murmansk Oblast, Russia, bortolanite occurs in two different associations:
(1) Together with ferri-katophorite and
phlogopite, bortolanite forms porous or mesh aggregates with euhedral
contours in the contact zone of a volcano–sedimentary xenolith and eudialyte
lujavrite at Kuamdespakhk Mountain.
(2) Bortolanite occurs in intergrowths with titanite and
fluorcaphite in the poikilitic
feldspathoid syenites at
Sengischorr Mountain.
In both cases, bortolanite was found in association with
rosenbuschite that is close to it in chemical composition, but, unlike
bortolanite, it contains no rare earth elements
(MM 88.4.380-391).
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